Well done, Minna
. The perspective is mathematically correct - except of course the telegraph lines.
But we see the typical errors when people concentrate too much on the theoretical construction.
1. The nearest (lower) corner is much too sharp. It can never
be sharper than 90°. Try it IRL: it is at its sharpest when looking down on it, and than it is 90°.
It is caused by putting the VP's much too close together.
2. Not enough "foreshortening", e.g. the chair. You could easily put two people on that seat.
But you did a good job on the basics, please move on to class 3